Robbin's questions are closer in style and difficulty level to step 1 path questions. Webpath is good for sheer volume and reinforcement of material, but I felt like their questions were easier than questions on boards (and school exams). Also I think there are some minor factual errors in webpath. If you are studying for step 1 I would definitely go with Robbins. If you are studying for a class exam it completely depends on your individual school's exam style. see what your course director recommends.